Frequencies for first 10,000 rows of prescr3 variable in namcs1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,877       18.77       18.77
          2 |        220        2.20       20.97
          3 |        147        1.47       22.44
          . |      7,756       77.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016